The True Demon King-Recarnated As Muzan Kibutsuji

!Warning: this is a Au mean that not like the canon of Kimetsu no Yaiba stonyline although It still follow the Demon slayer story line but it is fanfincion so you guys can enjoy ^-^

A 18 year olds boy who was a fan of anime and manga (especially kimetsu no yaiba ). He love watching and reading it everyday , one day , he dead by a plane that crashed directly into him and then he was reincarnated into kimetsu no yaiba, but he didn't know that the man he reincarnated from was the demon king, the original demon : Muzan Kibutsuji (before demon). The journey of over 1000 years started